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Active acoustic control apparatus

a technology of active acoustic control and control apparatus, which is applied in the direction of acoustic signal devices, instruments, transportation and packaging, etc., can solve the problems of insufficient development, inability to cancel the sound effect, and inability to improve the sound quality

Active Publication Date: 2013-02-19
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The system ensures consistent and effective cancellation of alert sounds within the vehicle by dynamically adjusting the cancellation sound output based on changes in the transfer characteristic, improving sound cancellation regardless of vehicle window states.

Problems solved by technology

Such a feature is advantageous in terms of noise, but it is inferior to the engine from the viewpoint of notifying the presence of the vehicle to pedestrians in the surroundings.
Depending on, for example, whether a vehicle window is opened or closed, however, the transfer characteristic from the external loudspeaker to the microphone is changed, thus causing a risk that an effect of canceling a sound, which is to be controlled, by the cancellation sound cannot be sufficiently developed unless the transfer characteristic from the external loudspeaker to the microphone is also taken into consideration.

Method used

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Examples

Experimental program
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Effect test

first embodiment

A. First Embodiment

1. Configurations of Entirety and Components

(1) Entire Configuration

[0022]FIG. 1 is a schematic view illustrating the configuration of a vehicle 10 equipped with an active acoustic control apparatus 12 (hereinafter referred to also as a “control device 12”) according to a first embodiment of the present invention. The vehicle 10 can be an electric vehicle (including a hybrid car, a fuel cell car, etc.).

[0023]The control device 12 includes a vehicle speed sensor 14, an exterior alert-sound control unit 16 (hereinafter referred to as an “alert sound ECU 16”), an external loudspeaker 18, a window sensor 20, a cancellation sound control unit 22 (hereinafter referred to as a “cancellation sound ECU 22”), and an internal loudspeaker 24.

[0024]In the control device 12, the alert sound ECU 16 determines the necessity to output an alert sound AS based on a vehicle speed signal Sv from a vehicle speed sensor 14. When the alert sound ECU 16 determines that the output of the a...

second embodiment

B. Second Embodiment

1. Configurations of Entirety and Components (Differences from First Embodiment)

[0066]FIG. 6 is a schematic view illustrating the configuration of a vehicle 10A equipped with an active acoustic control apparatus 12a (hereinafter referred to also as a “control device 12a”) according to a second embodiment of the present invention. The vehicle 10A is basically similar to the vehicle 10 in the first embodiment, but it differs from the vehicle 10 in the following points. While the cancellation sound ECU 22 in the vehicle 10 generates the second control signal Sc2 by using the fixed filter 52, a cancellation sound control device 22a (hereinafter referred to as a “cancellation sound ECU 22a”) in the vehicle 10A generates the second control signal Sc2 through the so-called adaptive control. Further, the second embodiment employs a microphone 28. The cancellation sound ECU 22a includes a microcomputer 40a and a memory 42a.

[0067]FIG. 7 is a schematic view illustrating th...

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Abstract

An active acoustic control apparatus includes an alert sound signal generator configured to generate an alert sound signal. An alert sound output device is configured to output an alert sound to an outside of a vehicle. A cancellation sound signal generator is configured to generate a cancellation sound signal representing a cancellation sound to cancel the alert sound, which has been transferred from the outside of the vehicle to an inside of the vehicle, at a sound cancellation target position inside the vehicle. A cancellation sound output device is configured to output the cancellation sound to the sound cancellation target position. The cancellation sound signal generator is configured to detect change of a transfer characteristic from the alert sound output device to the sound cancellation target position and to vary an output characteristic of the cancellation sound depending on the change of the transfer characteristic.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application claims priority under 35 U.S.C. §119 to Japanese Patent Application No. 2010-011169 filed Jan. 21, 2010, entitled “ACTIVE ACOUSTIC CONTROL APPARATUS.” The contents of this application are incorporated herein by reference in their entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an active acoustic control apparatus.[0004]2. Description of the Related Art[0005]Generally, a driving motor for an electric vehicle is quieter than an engine. Such a feature is advantageous in terms of noise, but it is inferior to the engine from the viewpoint of notifying the presence of the vehicle to pedestrians in the surroundings. Taking into account the above-described situation, an electric vehicle is developed which generates an alert sound from an external loudspeaker (i.e., a loudspeaker mounted as an external component to a vehicle body) while the vehicle is moving (see, fo...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B60Q1/22B60Q1/26
CPCB60Q5/008
Inventor INOUE, TOSHIO
Owner HONDA MOTOR CO LTD